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C. F. COUVE. PROCESS OF MANUFACTURING PUPPET VALVES. APPLICATION FILED MAY 12, 1919.

1 3371001 Patented pr. 13, 1920.

UNITED PATENT OFFICE.

CHARLES F. COUVE, OF AURORA, ILLINOIS, ASSIGNOR TO COUVE-DUNHAM COMPANY,

A COPARTNERSHIP CONSISTING OF 'IIHOMAS M. DUNHAM AND CHARLES F. COUVE.

PROCESS OF MANUFACTURING PUPPET-VALVES.

Specification of Letters Patent.

Patented Apr. 13, 1920.

Application filed May 12, 1919. Serial No. 296,351.

' turing Puppet-Valves, of which the following is a specification.

Ordinarily a puppet valve comprises a circular valve diskin conjunction with a central stem by which its movements are guided and by which it is raised and lowered. Since the valve disk operates in contact with the extremely high temperatures existing within the engine, and since it seats periodically upon its seat to close the passage therethrough, and since it must effectively perform the function of closing such passage in order to operate successfully, it becomes necessary to use material capable of performing such results,-while operating under the high temperature conditions which it encounters. This ordinarily means that it is very desirable to use a special composition or alloy steel for the valve disk.

Since the valve stem performs chiefly the function of guiding the disk in its lifting and seating movements, it is not ordinarily necessary to use special or alloy steel in its construction and, in fact, it is often desirable to use some other or different and cheaper steel in order to reduce the cost of manufacture.

The foregoing reasons are mentioned as being some of the reasons why it is desirable to form the stem and the disk from will appear from a detail description of the same which consists in the features of construction and combinations of parts hereinafter descr1bed and claimed.

In the drawing: Figure 1 shows a sideview of a valve embodying the features of the present invention.

Fig. 2 shows a view of the die and press head for attaching the valve head to the stem, the parts being separated, and also shows the valve stem and head block set into place for the finishing operation.

Fig. 3 shows a view of the die block after the assembling operation has been completed, but before the removal of the valve therefrom. I

In order that the application and use of the features of the present invention may be more readily understood, I have shown in Fig. 1 a typical puppet valve embodying the features of the present invention. It includes the stem i and circular head The head 5 is provided with the seating surface 6 and neck or nipple 7 into which the stem 4 is fastened. i

The head 5 and stem 4 are formed in the larged or tapered outwardly and in manv cases it may also be provided with the side cuts or recesses 9 and 10. The head block 11 is circular in form and is provided with a central drill opening into which the upper or head portion of the stem may be set. as shown in Fig. 2. It will be observed that at this stage of the proceeding there is a slight opening provided between the stem and the block into which it has been set.

A die block 12 is provided in conjunction with a press head 13. Said die block has a vertically extending passage or opening 14 through which is set the stem 4. In direct communication with the upper end of said passage 14 is a die opening 15 of contour suitable for the correct formation of the valve head when the pressing operation is completed.

hen the head is to be attached to the stem, the head block is heated to a suitable temperature, such, for example, as a cherry red or a bright red, and it is then set down over the upper projecting end of the stem 4, which stem was previously set into place within the die block 12. Thereupon, the press head 13 is forced down so as to squeeze the metal of the head block 11 into every portion of the die recess or opening and compel said metal to take exactly the contour of theopening. It will be observed that the lower portion of the opening tapers inwardly. for the formation of the tapered "neck 7. This form of opening also compels the metal to draw inwardly around the stem below the enlargement 8 thereof, so as to very securely attach the head block to the stem. It is therefore evident that the tapered or conical form of the central part of the die opening serves two beneficial purposes, in that it provides the desired shape for the neck 7 and also compels the firm attachment of the head block to the stem.

I Wish to state that while I have previously mentioned the use of two separate and distinct kinds of metal, still, in some cases, it might bedesirable to practise the features of the present invention by the use of a stem-and head formed both of the same kind of metal and, therefore, I do not limit myself to the use of two kinds of metal except as I may do so in the claims.

I cla"=n:

1. Tl: process for the manufacture of puppet 'alves from two pieces of metal, which includes heating a block of metal having an opening or recess for the accommodation of the end of the stem to a temperature suitable for forging purposes, and thereafter compelling said head to take the form of a circular disk valve head by forcing the same into a die of suitable contour by a pressure exerted-on said head in a direction parallel to the direction of the stem, substantially as described.

2. The process for the manufacture of puppetvalves having valve stems and circular disk heads from two pieces of metal, which consists in setting a valve stem into a die block having a female die of contour suitable for the formation of the valve head,

the end portion of the stem projecting into said die, thereafter setting a block of head steel onto the end of the stem and thereafter forcing said block of head steel into said female die by a movement in a direction parallel to the direction of the stem to thereby compel the material of the head steel to take the form of said die and create the end of the stem, substantially as described.

3. The process for the manufacture of puppet valves having stems and disk heads from two pieces of metal, which consists in setting a valve stem into a die block having a female die of contour suitable for the formation of the valve head, including a tapering neck surrounding the point of attachment of the stem, thereafter setting a block of head metal onto the end of the stem and thereafter forcing the block of head metal to take the contour of the female die and of said tapering neck by a movement in a direction parallel to the direction of the stem, whereby the material of said head block is forced to firmly engage the stem as it enters said tapering neck portion of the die, substantially as described.

CHARLES F. COUVEa 

